From owner-freebsd-isp Mon Sep 17 3: 8: 7 2001 Delivered-To: freebsd-isp@freebsd.org Received: from jake.akitanet.co.uk (jake.akitanet.co.uk [212.1.130.131]) by hub.freebsd.org (Postfix) with ESMTP id 90EE437B43A for ; Mon, 17 Sep 2001 03:08:02 -0700 (PDT) Received: from dsl-212-135-208-201.dsl.easynet.co.uk ([212.135.208.201] helo=wopr.akitanet.co.uk) by jake.akitanet.co.uk with esmtp (Exim 3.13 #3) id 15ivJc-000F4c-00; Mon, 17 Sep 2001 11:07:49 +0100 Received: from wiggy by wopr.akitanet.co.uk with local (Exim 3.21 #2) id 15ivJm-0006ya-00; Mon, 17 Sep 2001 11:07:58 +0100 Date: Mon, 17 Sep 2001 11:07:58 +0100 From: Paul Robinson To: Martyn Routley Cc: Freebsd-ISP Subject: Re: Looking for DNS advice Message-ID: <20010917110758.E24811@jake.akitanet.co.uk> References: <183367723.20010911171449@com2com.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ; from staff@invictanet.co.uk on Mon, Sep 17, 2001 at 10:56:46AM +0100 X-Scanner: exiscan *15ivJc-000F4c-00*$AK$uk5qmMB70i9TEs9.zGQXc1* Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Sep 17, Martyn Routley wrote: > We are soon making 2 fundamental changes to our network. > > 1) A change of provider, requiring us to change our IP address allocation. > 2) A physical change of location. > > We expect to be "switched off" for no more than 2 hours while servers are > moved from old to new locations. > > Both changes are happening at the same time. Can anybody suggest ways of > configuring our DNS to ensure that we are visible again as soon as possible > after the move? Seven days before you move, bring your TTL and Expire in the zone files down to 3600 (one hour). When you go to move, bring it down to 5 minutes. When you've moved, bring it back upto a week again for normal service. All of this means that people are going to be querying you a lot and so will pick up the changes quite quickly when you move. However, some stupid Windows boxen will always cache for 7 days, no matter what you do. In an ideal world you would have kit on both sites, both IP ranges temporarily serving both and then you could do some clever round-robin'ing for a week or so. Alternatively, consider moving to something like 'eddie' for a while to help you juggle this. Good luck with changing all those NS records for the domains you're hosting (if you have many). :-) -- Paul Robinson ,--------------------------------------- Technical Director @ Akita | A computer lets you make more mistakes PO Box 604, Manchester, M60 3PR | than any other invention with the T: +44 (0) 161 228 6388 (F:6389)| possible exceptions of handguns and | Tequila - Mitch Ratcliffe `----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message